Dual Fuel Engine
Dual Fuel or DF Engines are the kind of engines that could run on a mixture of diesel fuel and gas fuel or it can run on diesel fuel alone. Duel Fuel engines are not able to work on gas alone since they do not posses an ignition system, nor do they have any spark plugs.

As diesel is not a pure gas, and it is not a pure diesel designed engine, it has some disadvantages in the department of Methane slippage as well as fuel efficiency.. For instance, the fuel efficiency may be 5% to 8% less than in a comparable lean-burn, spark-ignited engine at 100 percent load. It could even be lower or higher loads.

Lift Truck Classification and Fuel Sources
There are some applications which have proved a challenge for the forklift. Like for example, scrap metal is amongst these issues. To be able to successfully handle items like this needs utilizing the right type of machinery for the task.

There are 7 major lift truck classes, including power sources like hydrogen fuel cell, liquid propane gas, gasoline, diesel and electric. The power source is linked to some of these specific classes. The main power sources for forklifts include Gasoline, Battery, Diesel, Propane and Fuel Cell.

Electric powered trucks are the most popular, mainly Class I, II and class III forklifts. Internal combustion engines are more popular in Classes IV and V. The most popular electric power source is the lead-acid battery. Out of internal combustion trucks, around more than 90 percent are propane powered.

The most common power source for lift trucks is battery. Battery fueled models make up around 60 percent of the new forklifts sold in the USA. Their benefits include: quiet operation, less maintenance requirements, the ability to be used outdoors and inside with no harmful emissions.